I'll start, this is my ideal scenario:
Marksman
One handed
Two handed
Polearm
Block
Hand to hand
Destruction
Alteration
Conjuration
Illusion
Restoration
Enchant
Alchemy
Sneak
Security
Acrobatics
Speechcraft & Mercantile
Smithing
An important thing here is that I don't foresee any classification like in previous games, since there are no classes. Skills will probably be based just on attributes, that's the way I see it.